I recently let down the hem on a pair of school pants.  When the pants were taken up originally, the mother pinned them on the child, and the child wanted them long, so she pinned to the ground.  She took them to someone and asked for a large hem.  Which they did.  A 10 cm (4 in) hem to be precise.  The problem I encountered with the pants was that the bottom of the pant had dragged on the ground, so the fold of the hem was tattered and frayed.  So whilst there was a 10 m (4 in) hem to let down, I had to bond and darn the tattered section of the pant.

So the moral to this story is, always have the pant hem just off the ground so that when the large hem is let down as the child grows, the pants will not be frayed.

Happy Sewing

Judith aka genie